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. Author manuscript; available in PMC: 2017 Feb 15.
Published in final edited form as: Chem Res Toxicol. 2016 Jan 21;29(2):162–168. doi: 10.1021/acs.chemrestox.5b00371

Figure 2.

Figure 2

Example GC×GC-TOFMS chromatograms for little cigar and cigarette samples. Top: Three-dimensional chromatograms, where x and y axes show retention times on first and second chromatographic columns, respectively, and z axis indicates combined responses from detected ions in mass spectra. Bottom: Two-dimensional chromatograms, where x and y axes show retention times on first and second chromatographic columns, respectively, and each dot indicates a peak, regardless of response.